 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal;

 import java.util.ArrayList ;
 import java.util.Iterator ;
 import java.util.List ;

 import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.IEditorReference;
 import org.eclipse.ui.IPropertyListener;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.IWorkbenchPart;
 import org.eclipse.ui.IWorkbenchWindow;

 /**
  * Closes all editors except ones with unsaved changes.
  */
 public class CloseAllSavedAction extends PageEventAction implements
         IPropertyListener {

     /**
      * List of parts (element type: <code>IWorkbenchPart</code>)
      * against which this class has outstanding property listeners registered.
      */
     private List partsWithListeners = new ArrayList (1);

     /**
      * Create an instance of this class.
      * @param window the window
      */
     public CloseAllSavedAction(IWorkbenchWindow window) {
         super(WorkbenchMessages.CloseAllSavedAction_text, window);
         setToolTipText(WorkbenchMessages.CloseAllSavedAction_toolTip);
         // @issue Should create a ID in IWorkbenchActionConstants when it becames API?
 setId("closeAllSaved"); //$NON-NLS-1$
 updateState();
         window.getWorkbench().getHelpSystem().setHelp(this,
                 IWorkbenchHelpContextIds.CLOSE_ALL_SAVED_ACTION);
         setActionDefinitionId("org.eclipse.ui.file.closeAllSaved"); //$NON-NLS-1$
 }

     /* (non-Javadoc)
      * Method declared on PageEventAction.
      */
     public void pageActivated(IWorkbenchPage page) {
         super.pageActivated(page);
         updateState();
     }

     /* (non-Javadoc)
      * Method declared on PageEventAction.
      */
     public void pageClosed(IWorkbenchPage page) {
         super.pageClosed(page);
         updateState();
     }

     /* (non-Javadoc)
      * Method declared on PartEventAction.
      */
     public void partClosed(IWorkbenchPart part) {
         super.partClosed(part);
         if (part instanceof IEditorPart) {
             part.removePropertyListener(this);
             partsWithListeners.remove(part);
             updateState();
         }
     }

     /* (non-Javadoc)
      * Method declared on PartEventAction.
      */
     public void partOpened(IWorkbenchPart part) {
         super.partOpened(part);
         if (part instanceof IEditorPart) {
             part.addPropertyListener(this);
             partsWithListeners.add(part);
             updateState();
         }
     }

     /* (non-Javadoc)
      * Method declared on IPropertyListener.
      */
     public void propertyChanged(Object source, int propID) {
         if (source instanceof IEditorPart) {
             if (propID == IEditorPart.PROP_DIRTY) {
                 updateState();
             }
         }
     }

     /* (non-Javadoc)
      * Method declared on Action.
      */
     public void run() {
         if (getWorkbenchWindow() == null) {
             // action has been dispose
 return;
         }
         IWorkbenchPage page = getActivePage();
         if (page != null) {
             ((WorkbenchPage) page).closeAllSavedEditors();
         }
     }

     /**
      * Enable the action if there at least one editor open.
      */
     private void updateState() {
         IWorkbenchPage page = getActivePage();
         if (page == null) {
             setEnabled(false);
             return;
         }
         IEditorReference editors[] = page.getEditorReferences();
         for (int i = 0; i < editors.length; i++) {
             if (!editors[i].isDirty()) {
                 setEnabled(true);
                 return;
             }
         }
         setEnabled(false);
     }

     /* (non-Javadoc)
      * Method declared on PageEventAction.
      */
     public void dispose() {
         super.dispose();
         for (Iterator it = partsWithListeners.iterator(); it.hasNext();) {
             IWorkbenchPart part = (IWorkbenchPart) it.next();
             part.removePropertyListener(this);
         }
         partsWithListeners.clear();
     }

 }

